Frekvenční měniče Katalogy, manuály (EN+CZ)

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Vydal: ABB s.r.o, ELSYNN Autor: ABB ELSYnn

Strana 805 z 825







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The ability ride through short supply interruptions is one the most important features MEGADRIVE-LCI Usually, your process just carries on without noticing anything. may assumed that the torque developed the motor approximately proportional the motor current, flux and power factor. 6 . The current controller (5) adjusts the current the brushless exciter varying its stator voltage via three-phase controller. Thus the current controller indirectly adjusts the torque exerted the shaft the motor varying the voltage at the output the line converter. They act the supply converter (rectifier), the machine converter (inverter) and the excitation system.Closed-loop control MEGADRIVE-LCI Closed-loop control functions Communication and interfaces The programmable high-speed controller communicates with the other control system modules via parallel bus capable of transferring the control function data at the required rate. Voltage controller The voltage controller (4) and the current controller (5) also form conventional cascade feedback circuit. B angle control B angle control (3) forward control function which determines the instant firing of the thyristors the machine converter. The speed controller provides the current controller with the set-point value necessary attain and maintain the required speed. Communication with other units the drive and with any higher level control system remote control centres takes place via corresponding interfaces controlling either parallel fast serial links. Speed controller The speed controller (1) and the current controller (2) form conventional cascade feedback circuit. The voltage controller provides the excitation current controller with the set­ point value needs attain and maintain the required voltage the motor terminals. The angel adjusted function current and speed such ensure correct commutation of the inverter. The most important regulation functions a LCI drive system are the feedback and forward control. Basically, the motor voltage adjusted in proportion the motor speed which is equivalent maintaining the motor flux its rated value